在学习Python时遇到一些麻烦练习方法48

Question

在本节中，我们给出了一系列单元测试，并且需要创建一个使测试通过的函数。这里是测试：

from nose.tools import * 
from testing import * 


def test_numbers(): 
    assert_equal(scan("1234"), [('number', 1234)]) 
    result = scan("3 91234") 
    assert_equal(result, [('number', 3), 
         ('number', 91234)]) 

还有其他方面的测试，但这是唯一一个没有通过。下面是我写的：

def convert_number(s): 
    try: 
     return int(s) 
    except ValueError: 
     return None 

def scan(s): 

    direction_words= ("north", "south", "east", "west", "down", "up", "left", "right", "back") 
    verbs= ("go", "stop", "kill", "eat") 
    stop_words= ("the", "in", "of", "from", "at", "it") 
    nouns= ("door", "bear", "princess", "cabinet")   
    numbers= s.split() 
    i=0 
    j=0 
    g=0 
    m=0 
    a=0 


    while a< len(numbers): 
     if type(convert_number(numbers[a])) == int: 
      return [('number', int(x)) for x in s.split()] 
     else: 
      a += 1 


    while i < 9: 
     if direction_words[i] in s.split(): 
      return [('direction', x) for x in s.split()] 
     else: 
      i+=1    

    while j < 4: 
     if verbs[j] in s.split(): 
      return [('verb', x) for x in s.split()] 
     else: 
      j+=1 

    while g < 6: 
     if stop_words[g] in s.split(): 
      return [('stop', x) for x in s.split()] 
     else: 
      g+=1 

    while m < 4: 
     if nouns[m] in s.split(): 
      return [('noun', x) for x in s.split()] 
     else: 
      m+=1 

    else: 
     return 

Answer 1

我怀疑，你一定要def scan(self, s):而不是def scan(s):。

Answer 2

只需将@staticmethod加上def scan(s):即可使其正常工作。